Underreamer.



G. B. SQUIRE.

UNDERRBAMER. v AAAAAAAAAAAAAAAAAAAAAAAAA 1.

1,017,333, I Patented Feb. 13, 1912.

IIVVEIVTIOR V 7 "aa're Y 5 Z ATTORNEYS Fig. 2.

GEORGE E. SQUIRE, OF JERSEY CITY, NEW JERSEY.

UNDERREAMER.

Specificationof Letters latent.

Patented Feb. 13, 1912..

Application filed May 29, 1911. Serial No. 630,022.

To all whom it may concern.-

Be it known that I, GEORGE S UIRE, a citizen of the United States, and aresident of Jersey City, in the county of Hudson and State of NewJersey, have invented a new and Improved Underreamer, of which thefollowing is a full, clear, and exact description.

The invention relates to well boring, and its 'object is to provide anew and improved under-reamer for enlarging the holes of wells below thestand pipe or casing, for lowering the latter to a desired depth, andarranged to insure quick and accurate reaming without danger of thecutters becoming clogged, at the same time allowing convenient loweringof the under-reamer into position, or withdrawing the same from the wellafter the reaming is completed.

For the purpose mentioned use is made,

of reaming cutters mounted to slide diametrically in the stock andprojected outwardly by a spring-pressed mandrel slidable lengthwise inthe stock and which looks the cutters in the projected active position.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a sectional side elevation of the under-reamer in positionin the casing prior to lowering the under-reamer to a lowermost activeposition; 2 is a like view of the same and showing the under-reamer inlower-,

most active position; Fig. 3 is a sectional plan view of the same on theline 3-3 of Fig. 1; Fig. 4 is a side elevation of the mandrel; and Fig.5 is a sectional plan view of the under-reamer on the line 55 of Thecylindrical stock A is provided at its upper end with the usual nipple Bfor connection with the stem reaching to the top of the well formanipulating the stock A in the usual manner. The stock A is providednear its lower end with diametrically-extending guideways A in which aremounted to slide the reaming cutters C, C adapted to be moved outwardinto active position and locked therein by a. mandrel D mounted to slidelengthwise in a central bore A formed in the stock A, as plainlyindicatedin the drawings. The lower end D of the mandrel D, is in theform of a point adapted to engage correspondingly beveled recesses Cformed in the inner ends of the cutters C and at the top thereof, thelowerends of the beveled recesses C terminating a distance from thebottom of the cutters C. The upper end D of the mandrel D is reduced toform a shoulder for the lower end of the spring E to rest on, the saidspring E extending in the upper portion of-the bore A and servingtopress the mandrel D downward so that the point D acts on the beveledrecesses C and thus pushes the cutters C outward into active position,that is, projecting the outer cutting ends of the cutters C beyond thesides of the stock A. The mandrel D after pressing the cutters C-outward engages with its body the inner straight ends of the cutters Cso as to lock the cutters C against inward or return movement, as willbe readily understood by reference to Fig. 2.

The mandrel D is provided with an opening D engaged by the inner end ofa lever F fulcrumed at F in a recess A formed in one side of the stockA, and the said lever F is provided with an outer cam-shaped end Fadapted to be engaged by the inner surface of the casing G to hold themandrel D in uppermost retracted position against the tension of thespring E, and during the time the stock A is lowered in the casing G(see Fig. 1).

It is understood that when the parts are in the position shown in Fig.1, the mandrel D is in uppermost position and the cutters C are ininnermost position to allow convenient lowering of the stock A in thecasing G, and when the lever F finally leaves the lower end of the shoeG of the casing G when the mandrel D is released by the lever F and thespring E now forces the mandrel D downward so as to cause the cutters Cto move outward into active position, as shown in Fig. 2 and abovedescribed.

' The outer ends of the cutters C are beveled and the sides thereof areprovided with grooves G engaged by pins H held in the stock A andserving to limit the outward sliding movement of the cutters C. In theplug I to limit the downward movement of the mandrel D, as will bereadily understood by reference to Fig. 2. I i

From the foregoing it will be seen that the under-reamer'can be readilylowered in the casing G and with the cutter C in withdrawn position, andwhen the stock A has been lowered sufliciently for the lever F to lowerend of the central bore A screws 3.

a it

clear the lower end of the shoe G then the spring E causes the mandrel Dto move downward whereby the mandrel forces the cutters G into outwardactive position and locks the same therein as before explained. Thestock A is now turned in the usual manner for the cutters to cut thematerial below the lower end of the casing G for enlarging the well holewith the object to lower the casing Gr; When it is desired to withdrawthe under-reamer then it is only necessary to exert an upward pull onthe stock A, so that the outer cam end it of the lever F is acted on bythe lower end of the shoe G to cause an upward swinging of the lever Fand with a view to lift the mandrel D against the tension of the springE and thus release the cutters C. Un further lifting of the stock A theouter beveled ends of the stock A come in contact with the lower end ofthe shoe G so that the cutters C are caused to slide inward to allow oflifting the stock A out of the casing Gr.

Having thus described my invention, ll claim as new and desire tosecureby Letters Patent:

1. [in under-reamer, comprising a stock having transverse waysintermediate its ends, and an axial bore, cutters mounted to slide insaid ways, a mandrel mounted to slide in said bore and movable outwardlybetween the cutters to spread the same, a spring bearing against saidmandrel to move the same outwardly, and meanswithin the stock andengaging the mandrel to move the same inwardly.

2. An under-reamer, comprising a stock having transverse ways and anaxial bore, transversely movable cutters mounted to slide in said ways,a transversely apertured mandrel mounted to slide in said bore andmovable outwardly between the cutters to spread the same, a springbearing against said mandrel to move the same outwardly, and a memberpivoted in the stock and having an outer cam portion and an innerportion extending within the aperture of said mandrel.

3. An under-reamer, comprising a stock, cutters mounted to slidediametrically in the stock and adapted to be withdrawn within the stockor moved outward to project beyond the sides of the stock, the innerends of the cutters being provided with bevels, a spring-pressed mandrelmounted to slide lengthwise in the stock and having a pointed endadapted to engage the said bevels of the said cutters to move the latteroutwardly, the body of the mandrel then passing between the inner endsof the cutters to hold the same locked in an outermost position, andmeans on the said stock and cutters to limit the outward movement of thecutters.

4. An under-reamer, comprising a stock,

arness under-reaming cutters mounted to slide transversely in the saidstock, a springpressed mandrel mounted to slide lengthwise in the stockand pressing the said cutters outwardly into active position and locleing the same therein, and ,a locking means for locking the mandrel inposition in the stock during the downward movement of the stock in'thewell casing, said means com prising a member pivoted in the stock andhaving a portion extending inwardly into engagement with the mandrel.

5. An under-reamer, comprising a stock, cutters mounted to slidediametrically in the stock and adapted to be withdrawn within the stockor moved outward to project beyond the sides of the stock, the innerends of the cutters being provided'with bevels, a spring-pressed mandrelmounted to slide lengthwise in the stock and having a pointed endadapted to engage the said bevels of the said cutters to move the latteroutwardly, the body of the mandrel then passing between the inner endsof the cutters to hold the same locked in outermost position, and alever fulcrumed on the stock and engaging the said mandrel to hold thelatter in retracted position, the outer end of the lever extendingbeyond the side of the stock for engagement with the well casing.

6. An under-reamer, comprising a stock having transverse guideways and acentral bore, cutters mounted to slide in the said guideways and havingouter beveled ends, the cutters being provided at their inner ends withbevels extending from the top to within a distance from the bottom ofthe cutters, a mandrel'mounted to slide in the said central bore andhaving a pointed lower end adapted to engage the said cutter bevels, aspring in the said bore and press ing the upper end of the said mandrel,and a lever iulcrumed on the said stock and en gaging with its inner endthe said mandrel, the outer end of the lever being adapted to projectbeyond the side of the stock.

7. An ,under-reamer, comprising a stock having transverse guideways anda central bore, cutters mounted to slide in the said guideways andhaving outer beveled ends, the cutters being provided at their innerends with bevels extendin from the top to within a distance from t ebottom of the cutters, a mandrel mounted to slide in the said centralbore and having a pointed lower end adapted toengage the said cutterbevels, a spring in the said bore and pressing the upper end of the saidmandrel, a lever fulcrumed on the said stock and engaging with its innerend the said mandrel, the outer end of the lever being adapted toproject beyond the side of the stock, and means for limiting thedownward sliding movement of the mandrel.

Mill

lid

lllld 8. An under-reamer, comprising a stock having transverse guidewaysand a central bore, cutters mounted to slide in the said guideways andhaving outer beveled ends, the cutters being provided at their innerends with bevels extending from the top to within a distance from thebottom of the cutters, a mandrel mounted to slide in the said centralbore and having a pointed lower end adapted to engage the said cutterbevels, a spring in the said bore and pressing the upper end of the saidmandrel, a lever fulcrumed on the said stock and-engaging with its innerend the said mandrel, the outer end of the lever being adapted toproject beyond 15 the side of the stock, and means for limiting theoutward movement of the said cutters. In testimony whereof I have signedmy name to this specification in the presence of two subscribingwitnesses.

GEORGE E. SQUIRE. Witnesses:

THEO. G. HOSTER, PHILIP D. ROLLHAUS.

